但由于乙烯基酯树脂的高化学极性，用普通增稠剂和亲水性气相法二氧化硅对其实现很好的流变性控制是相当困难的。
Due to the high polarity of vinyl ester chemistry, it is known to be difficult to control the rheology with normal thickening additives or hydrophilic fumed silica.
结果显示，在减肥的一开始就禁食或近似禁食会改变大脑化学物质，对情绪和积极性造成不利影响，也会打击人地减肥努力。
The results suggest that beginning a diet with a fast or near-fast may alter brain chemistry in a way that adversely affects mood and motivation, undermining the person's weight-loss efforts.
研究显示光线可以刺激大脑产生化学物质，改善人们的情绪并提升积极性。
Research suggests that light stimulates brain chemicals that improve mood and increase motivation.
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